linux-kernel - Re: [patch] drop epoll max_user_instances and rely only on max_user

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Date:	Sat, 31 Jan 2009 17:30:21 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	mtk.manpages@...il.com
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, Willy Tarreau <w@....eu>,
	Bron Gondwana <brong@...tmail.fm>
Subject: Re: [patch] drop epoll max_user_instances and rely only on 
 max_user_watches

On Sun, 1 Feb 2009, Michael Kerrisk wrote:

> Hi Davide,
> 
> On Fri, Jan 30, 2009 at 7:54 AM, Davide Libenzi <davidel@...ilserver.org> wrote:
> > On Thu, 29 Jan 2009, Michael Kerrisk wrote:
> >
> >> Since max_user_instances was added in 2.6.28, and this is an ABI
> >> change, I suggest this should go into .29-rc, so that
> >> max_user_instances spends as little time in the wild as possible.
> >
> > Agreed, like I already told Andrew. Sorry Michael for the double change to
> > the man page :/
> 
> So is the right change to the epoll(7) page (see
> http://www.kernel.org/doc/man-pages/online/pages/man7/epoll.7.html )
> to simply remive the text on max_user_instances:
> 
>        /proc/sys/fs/epoll/max_user_instances (since Linux 2.6.28)
>               This  specifies  an  upper  limit on the number of epoll
>               instances that can be created per real user ID.
> 
> Or are other changes also required?

Yes. Plus, max_user_watches, instead of being 1/32 of lowmem, it's 4%. 
Just a detail.



- Davide


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